On Sat, 31 Dec 2016 01:48:30 -0800 (PST), RichA
wrote:

Earth-like? I'd believe it when they get there. Here's the travel time:

-Current rocket technology (if a large enough one could be built): 120,000mph.
25,000 years to get there.

-Project Orion 10,000 ton class ship: 80% speed of light peak speed.
14 years.

http://www.cnn.com/videos/world/2016...d-orig-nws.cnn

We lack fundamental technology to even travel at 0.1 C. Not because of
propulsion technology, but because the spacecraft would be destroyed
by collisions with interstellar dust particles.